No head coach in professional sports faces more criticism or pressure than a National Football League head coach.

There's only 32 coaches in the NFL, and with just 16 games played per season, everyone is under a giant microscope. One misstep, and they could be fired.

Every year there's a few coaches that face more pressure than most coaches do. They know this year could be their last with the team.

This year, there are four coaches on the hot seat:

Marvin Lewis, Cincinnati Bengals

Most coaches get a three- to five-year window to win a playoff game. Apparently that's not the case in Cincinnati. Lewis has been coaching the Cincinnati Bengals for 11 seasons, and he hasn't won a single playoff game. Incredibly, Lewis is the second longest tenured head coach in all of pro football. Maybe the Bengals should set their standards a little bit higher. Lewis has been handed some of the most talented players in the league, but he hasn't shown he can lead a team in the playoffs.

Jason Garrett, Dallas Cowboys

No shocker here. Being the coach of the Dallas Cowboys is always a tough position. When you win, you're the best. When you lose, you're the worst. Garrett has been with the Cowboys since 2010 compiling a record of 29-27. Although he has a (barely) winning record, the Cowboys have never made it to the playoffs even one time with Garret as their head coach. Garret constantly abandons the run game, which comes as no surprise considering he used to play quarterback, for the Cowboys.

Jerry Jones fired Wade Phillips after he went 34-22 and won a playoff game during his four year tenure in Dallas.

Rex Ryan, New York Jets

Ryan is one of the best defensive minds in the NFL. His first two years as the New York Jets head coach, he led the team to the AFC Championship game. He's won four playoff games, and has created one of the best defensive units in the league during his time. However, the last three seasons Ryan has missed the postseason completely and has a 22-26 record. If the Jets miss the playoffs this season, Ryan may be looking for a defensive coordinator position elsewhere.

Mike Smith, Atlanta Falcons

Mike Smith has been the Atlanta Falcons coach for six seasons. He's done a good job in Atlanta compiling a 60-36 record since 2008. He's a "play it safe" coach who rarely takes risks. So why should he be on the hot seat? Although he has a great regular season record, Smith only has one playoff victory as a head coach. Last season, his Falcons went 4-12. If Smith misses the postseason this year, that would give him just one postseason victory over seven seasons. And that could be enough for Atlanta to show him the door.

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